Set-screw guard.



S. S. COOK.

SET SCREW GUARD.-

APPLICATION P111111 AUG. 21, 1911.

Patented June 4, 1912.

Ma @ZZL STETSON S. COOK, 0F FALLS CITY, OREGON.

sn'r-sonnw GUARD.

Specification of Letters Patent.

Patented June 4, 1912.

Application filed August 21 1911. Serial No. 645,150.

To all whom it may concern:

Be it known that I, STETsoN S. Coon, a citizen of the United States,residing at Falls City, in the county of Polk and State of Oregon, haveinvented certain new and useful Improvements in SetScrew Guards; and Ido hereby declare the following to be a full, clear, and eXactdescription of the same, reference being had to the accompanyingdrawings, forming part of this specification, and to the figures andletters of reference marked thereon.

This invention relates to devices for inclosing or protecting set screwsemployed to secure collars and other parts on rotating shafts, theobjects of the invention being to provide a simple device adapted to besecurely held in place by the screw itself and with which access to thehead of the screw is permitted by a simple transverse movement of theguard.

The invention consists primarily in a set screw housing mounted on theshaft and held substantially concentric therewith by a spring, butadapted to be moved to an eccentric position by transverse pressure, andwhen so moved to expose the head of the screw for the application of awrench or other implement for adjusting the same.

The invention further consists in certain novel details of constructionand combinations and arrangements of parts, all as will be now describedand pointed out particularly in the appended claims.

In the accompanying drawings,Figure 1 is a perspective view of a shortsection of a shaft having thereon a collar held by a set screw and aguard for the same embodying the present invention; Fig. 2 is an endelevation with the shaft in section; Fig. 3 is a view looking at theopposite side of the parts from Fig. 2; Fig. 4 is a view correspondingto Fig. 2, but with the guard pressed transversely to give access to thehead of the screw; Fig. 5 is a longitudinal section-with the shaft andscrew in elevation; Fig. 6 is a perspective view of the housing alone;Fig. 7 is a similar view of the spring for holding the housing inposition to prevent access to the screw.

Like letters of reference in the several figures indicate the sameparts.

The shaft A and collar B held thereon by the set-screw C are all ofconventional form, and it will be understood are merely illustrative ofdevices of similar character commonly employed in connection withmachinery of various kinds. Inall this class of devices, the irregularlyprojecting portions and especially the outer ends and heads of the setscrews are liable to strike and do injury to movable parts adjacentthereto, or to'catch the clothing or persons of bystanders or workmen.To overcome this difficulty and provide a guard which will normallyoccupy a positionsubstantially concentric with the shaft, I provide anannular housing D held in concentric position on the shaft and aroundthe collarand set screw by a flat spring E located within the housingand bearing centrally on the collar and at its ends against the innerface of the housing. The normal position of the housing is shown inFigs. 1, 2 and 3 and should access to the set screw be desired, thehousing is displaced transversely against the tension of the spring, forexample, as indicated in Fig. 4.

In the preferred construction, and as illustrated in the drawings, theannular housing is provided with an aperture d for the accommodation ofthe head of the set screw and through which the head of the screw mayproject when the housing is pressed transversely, as shown in Fig. 4.The spring is also provided with an aperture e for the passage of theset screw, whereby the parts are held in proper position with relationto the shaft and collar. In this preferred construction the housing isprovided with a radial wall F having a shaft aperture f therein,elongated in the direction from which the housing is dis placedtransversely to give access to the set screw. The portion of theaperture f normally in contact with the shaft is concentric to the axisand serves as the means for limiting the movement of the guard under theinfluence of the spring E, but it is obvious that the housing maycontact with the collar or with the shaft on either side of the collarto secure the same result.

The aperture for the head of the set screw not only serves to giveaccess to the screw when the guard is displaced transversely, but alsoholds the guard in proper position with relation to the collar andshaft.

The parts should be so proportioned that the outer face or end of theset screw is substantially flush with the periphery of the guard when innormal position, as indicated in Figs. 1, 2 and 3, or in any event itshould not project beyond the guard except when the guard is purposelydisplaced for adjusting the screw.

What I claim as new, is:

1. A set screw guard embodying an annular housing adapted to encirclethe shaft, collar and screw and to be displaced. transversely to giveaccess to the screw, and a spring mounted within and engaging at itsends the inner side of the housing and. adapted to bear centrally on thecollar in the same transverse plane, for yieldingly holding the housingagainst transverse displacement.

2. A set screw guard embodying an an nular housing having an aperturetherein for the head of the screw and a spring within the housing foryieldingly supporting the housing whereby the housing may be displacedtransversely to expose the screw through the aperture.

3. A set screw guard embodying a hous ing having a shaft openingelongated transversely to permit of lateral displacement of the housingon the shaft and a spring for yieldingly holding the housing insubstantially concentric position.

4. A set screw guard embodying an an nular housing having a radial wallwith a shaft opening therein elongated transversely to permit of lateraldisplacement of the housing on the shaft, and a spring mounted withinthe housing and having an aperture for the screw, whereby the parts areheld in position on the shaft and may be displaced transversely to giveaccess to the screw.

5. A set screw guard embodying a housing having a radial wall with anopening therein elongated transversely to permit of transversedisplacement of the housing on nular housing having an aperturethereinfor the set screw and a radial wall having an opening thereinelongated transversely to permit of transverse displacement of .thehousing on the shaft, and a fiat spring having a central aperture forthe passage of the screw, said spring being located within the housingand engaging at its ends the inner side of the housing and adapted toengage at its center the part held by the screw, whereby the housingwill be held in concentric position and may be displaced transversely togive access to the head of the screw.

In testimony subscribed my name.

' STETSON S. COOK. Witnesses:

JAY A. PADDOOK, OSCAR HAYTER.

I Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. 0.

whereof, I have hereunto

